An adjustable on-line intelligent overvoltage detection device

Abstract

The present invention discloses an adjustable on-line intelligent overvoltage detection device, which relates to the field of overvoltage detection. It includes a main body housing, a detection unit is arranged inside the main body housing, and further includes a storage bin, in which a plurality of storage seats are arranged for storing a plurality of functional modules. A magnet A is installed in the connection base, a conductive contact is arranged on one side of the connection base, a thimble is arranged on one side of the plug module, and another magnet B is arranged inside it. A limiting mechanism is used to limit the movement of the connection base. The locking mechanism includes a calibration block and a calibration groove respectively installed on the opposite sides of the connection base and the plug module. Through the magnetic attraction of magnet A and magnet B, the functional module and the plug module are automatically aligned and locked, reducing the manual adjustment steps, improving the docking efficiency and reliability. By using the cooperation of the calibration block and the calibration groove, the plug docking is divided into two stages: preliminary adsorption and precise conduction, ensuring the precise contact between the thimble and the conductive contact, and avoiding conduction failure caused by deviation.

Description

Technical Field

[0001] The present invention relates to overvoltage detection technology, and particularly to an adjustable online intelligent overvoltage detection device. Background Art

[0002] With the complexity of power systems, the importance of overvoltage detection devices in power grid monitoring has become increasingly prominent. In the prior art, most overvoltage detection devices adopt a fixed plug design, which is difficult to adapt to diverse detection scenarios. For example, Chinese Patent No. CN116577547B discloses an overvoltage monitor that switches plug types such as electric clamps, USB connectors, and electric pens by rotating a handle, and realizes automatic power-on by using an airbag and a sliding block.

[0003] However, this solution has the following deficiencies: During operation, the handle needs to be rotated frequently, which is likely to cause structural wear and may lead to poor contact after long-term use; the plug is fixedly connected to the detection unit, making it difficult to quickly replace or expand function modules. In addition, traditional detection devices need to adjust the position multiple times during the plugging and unplugging process, and the operation is cumbersome. Therefore, there is an urgent need for an overvoltage online detection device with high-precision docking, modular expansion, and antioxidant properties. Summary of the Invention

[0004] The purpose of the present invention is to provide an adjustable online intelligent overvoltage detection device to solve the above deficiencies in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An adjustable online intelligent overvoltage detection device, including a main body housing, a detection unit is arranged inside the main body housing, and further includes:

[0006] A storage bin, inside which a plurality of storage seats are arranged for storing a plurality of function modules. The function module is composed of a connection base and a function head. A magnet A is installed inside the connection base, and a conductive contact is arranged on one side of the connection base;

[0007] A plug module, on one side of which a thimble is arranged, and another magnet B is arranged inside it;

[0008] A limiting mechanism, which is arranged on one side of the storage seat for restricting the movement of the connection base;

[0009] A locking mechanism, which includes a calibration block and a calibration groove respectively installed on the opposite sides of the connection base and the plug module. The locking mechanism has a first unlocking state and a second unlocking state. In the first unlocking state, the edges of the calibration block and the calibration groove are in contact, and the plug module and the storage seat can rotate relative to each other. In the second unlocking state, the calibration block is embedded in the calibration groove, and the thimble is in contact with and conducts electricity with the conductive contact;

[0010] During detection, the plug module moves axially along the storage base and first acts on the limit mechanism to release the restriction on the connection base. Magnet B acts on Magnet A to move the functional module to the first unlocked state, and then the plug module is rotated to move the functional module to the second unlocked state.

[0011] Furthermore, the calibration block has a convex portion, and the calibration groove has a groove corresponding to the convex portion. When the plug module rotates relative to the storage base, there is only one position where docking can occur so that the calibration block can enter the calibration groove.

[0012] Furthermore, the limit mechanism includes a limit rod and a trigger rod. A first sliding groove for the limit rod to slide is provided in the storage base. The end of the limit rod is located inside the storage base. A limit groove adapted to the end of the limit rod is provided on the circumference of the connection base. A first spring is installed in the first sliding groove, and the elastic force of the first spring acts on the limit rod to make the limit rod tend to move towards the inside of the storage base. A sliding cavity for the trigger rod to move is provided in the limit rod. The trigger rod is in contact with the limit rod through an inclined inclined surface portion. When the trigger rod is pressed, it pushes the limit rod to compress the first spring.

[0013] Furthermore, a spring piece is installed between the trigger rod and the storage base.

[0014] Furthermore, the locking mechanism further includes a locking groove opened on the inner side of the storage base. The locking groove is composed of a first groove, a second groove, and a third groove. Both the first groove and the third groove are arranged along the axial direction of the storage base. The end of the first groove is located at the end face of the storage base. The second groove connects the first groove and the third groove. A locking shaft is provided on the circumference of the connection base, and the locking shaft can move along the locking groove.

[0015] Furthermore, the ejector pin is slidably connected to the inner wall of the plug module. A second spring is provided between the ejector pin and the plug module, and the elastic force of the second spring acts on the ejector pin to make it tend to move away from the plug module.

[0016] Furthermore, a friction plate is provided on one side of the connection base. The friction plate is installed on an arc-shaped seat. The arc-shaped seat is slidably connected to the inner wall of the connection base through a guide rod. An arc-shaped groove is opened on one side of the connection base, and the arc-shaped groove is located between adjacent conductive contacts. The arc-shaped seat can move into the arc-shaped groove, and a third spring is sleeved on the guide rod.

[0017] Furthermore, the detection unit includes a differential amplifier circuit and a signal conditioning circuit. The differential amplifier circuit and the signal conditioning circuit are used to cooperate with the plug module and the functional module after conduction to perform on-line detection of overvoltage;

[0018] The differential amplifier circuit includes an equivalent mutual capacitance C m1 、equivalent mutual capacitance Cm2 , mutual capacitance C m0 , stray capacitance C to ground s1 , stray capacitance C to ground s2 , impedance R m and a differential amplifier, the equivalent mutual capacitance C m1 is electrically connected to the equivalent mutual capacitance C m2 , the mutual capacitance C m0 is connected in series between the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 , the two ends of the impedance R m are electrically connected to the two ends of the mutual capacitance C m0 , the input ends of the differential amplifier are respectively connected to the two ends of the impedance R m , the stray capacitance C to ground s1 has one end electrically connected between the mutual capacitance C m0 and the equivalent mutual capacitance C m1 , the stray capacitance C to ground s1 has the other end grounded, the stray capacitance C to ground s2 has one end electrically connected between the mutual capacitance C m0 and the equivalent mutual capacitance C m2 , the stray capacitance C to ground s2 has the other end grounded, the differential amplifier circuit is electrically connected to the signal conditioning circuit.

[0019] Furthermore, the connection position of the stray capacitance C to ground s1 with the mutual capacitance C m0 and the equivalent mutual capacitance C m1 is node ②, the connection position of the stray capacitance C to ground s2 with the mutual capacitance C m0 and the equivalent mutual capacitance C m2 is node ③, the middle connection position between the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 is node ①, the potential of node ① is the potential of the conductor under test, and its potential is U i , the potentials of node ② and node ③ are the output potentials of two measurement electrodes with different equivalent areas, and their potential difference is U o .

[0020] Furthermore, the node equation transfer functions of node ①, node ② and node ③ are:

[0021] (1);

[0022] In the formula:

[0023] ;

[0024] ;

[0025] Among them, the amplitude-frequency characteristic in the node equation transfer function is:

[0026] (2);

[0027] The phase-frequency characteristic in the node equation transfer function is:

[0028] (3);

[0029] where ω is the frequency.

[0030] Compared with the prior art, an adjustable on-line intelligent overvoltage detection device provided by the present invention has the following beneficial effects:

[0031] 1. For the adjustable on-line intelligent overvoltage detection device, through the magnetic attraction between magnet A and magnet B, the function module and the plug module are automatically aligned and locked, reducing manual adjustment steps, improving the docking efficiency and reliability. By using the cooperation of the calibration block and the calibration groove, the plug docking is divided into two stages: preliminary adsorption and precise conduction, ensuring the precise contact between the thimble and the conductive contact, and avoiding conduction failure caused by deviation; multiple replaceable function modules (such as electric clamps, probes, etc.) are provided in the storage bin, and users can quickly replace them according to needs to adapt to complex detection scenarios;

[0032] 2. For the adjustable on-line intelligent overvoltage detection device, through the scraping movement of the friction plate and the thimble, the oxide layer on the contact surface is automatically removed, ensuring the conductive stability during long-term use;

[0033] 3. For the adjustable on-line intelligent overvoltage detection device, through the coordinated action of the limiting mechanism and the locking groove, the function module is fixed in the non-use state, preventing displacement caused by transportation or vibration, and improving the durability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0035] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0036] Figure 2 It is a schematic diagram of the structure of the storage base, function module and plug module provided by an embodiment of the present invention;

[0037] Figure 3Schematic diagram of the separated state of the functional module and the storage base provided by the embodiment of the present invention;

[0038] Figure 4 Schematic diagram of the structure in which the protrusion on the calibration block provided by the embodiment of the present invention is in the shape of a flange and a cylinder;

[0039] Figure 5 Schematic diagram of the limiting mechanism provided by the embodiment of the present invention;

[0040] Figure 6 Schematic diagram of the connection base and the plug module when the friction plate is provided by the embodiment of the present invention;

[0041] Figure 7 Schematic diagram of the structure in which the storage bin provided by the embodiment of the present invention is a cylindrical bin;

[0042] Figure 8 Schematic diagram of the differential amplifier circuit provided by the embodiment of the present invention;

[0043] Figure 9 Schematic diagram of the multi-ring parallel electrode PCB provided by the embodiment of the present invention.

[0044] Explanation of reference numerals:

[0045] 1. Main body housing; 2. Storage bin; 21. Storage base; 22. Functional module; 221. Connection base; 222. Functional head; 223. Conductive contact; 224. Friction plate; 225. Arc-shaped seat; 226. Guide rod; 227. Arc-shaped groove; 228. Third spring; 23. Door panel; 24. Rotary button; 3. Plug module; 31. Thimble; 32. Second spring; 33. Pressing ring; 34. Rotating part; 4. Limiting mechanism; 41. Limiting rod; 42. Trigger rod; 43. First chute; 44. Limiting groove; 45. First spring; 46. Sliding cavity; 47. Inclined surface part; 48. Spring piece; 5. Locking mechanism; 51. Calibration block; 52. Calibration groove; 53. Protrusion; 531. Flange; 532. Cylinder; 54. Groove; 55. Locking groove; 551. First groove; 552. Second groove; 553. Third groove; 56. Locking shaft. Detailed implementation manners

[0046] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further introduced in detail below with reference to the accompanying drawings. Embodiment

[0047] Please refer to Figure 1 - Figure 7 , an adjustable on-line intelligent overvoltage detection device, including a main body housing 1, a detection unit is arranged in the main body housing 1, and further includes:

[0048] Storage bin 2, inside which there are multiple storage seats 21 for storing multiple functional modules 22. The functional module 22 is composed of a connection base 221 and a functional head 222. A magnet A (not shown in the figure) is installed inside the connection base 221, and a conductive contact 223 is provided on one side of the connection base 221;

[0049] Plug module 3, on one side of which there is a thimble 31, and another magnet B (not shown in the figure) is installed inside it;

[0050] Limit mechanism 4, which is provided on one side of the storage seat 21 for restricting the movement of the connection base 221;

[0051] Locking mechanism 5, which includes a calibration block 51 and a calibration groove 52 respectively installed on the opposite sides of the connection base 221 and the plug module 3. The locking mechanism 5 has a first unlocking state and a second unlocking state. In the first unlocking state, the edges of the calibration block 51 and the calibration groove 52 are in contact, and the plug module 3 and the storage seat 21 can rotate relative to each other. In the second unlocking state, the calibration block 51 is embedded in the calibration groove 52, and the thimble 31 is in contact with and conducts with the conductive contact 223;

[0052] During detection, the plug module 3 moves axially along the storage seat 21 and first acts on the limit mechanism 4 to release the restriction on the connection base 221. The magnet B acts on the magnet A to move the functional module 22 to the first unlocking state, and by rotating the plug module 3, the functional module 22 is moved to the second unlocking state.

[0053] As Figure 1 shown, the storage bin 2 can carry multiple functional modules 22. The connection bases 221 of each functional module 22 are the same, but the functional heads 222 are different. The functional heads 222 can be matched according to the actual detection requirements, such as electric clamps, USBs, and probes, etc. The storage bin 2 can be equipped with an independent door panel 23 to enclose each functional module 22 in the main body housing 1. The storage bin 2 can also be set as a cylindrical bin body 532. As Figure 7 shown, by rotating the rotary button 24, the multiple internal functional modules 22 can be sequentially rotated to the position of the door panel 23 of the cylindrical bin body 532. After the door panel 23 is opened, the connection between the plug module 3 and the functional module 22 can be carried out.

[0054] As Figure 2As shown, the function of the limiting mechanism 4 is to fix the functional module 22 located in the storage seat 21, so that it can stably limit the movement of the functional module 22, and avoid shaking or position displacement of the functional module 22 during movement or transportation, which affects the subsequent detection operation. When the plug module 3 needs to be connected with one of the functional modules 22, the plug module 3 is first moved toward the functional module 22, and the limiting mechanism 4 is triggered to release the restriction on the connection base 221. At this time, the magnet A and the magnet B attract each other, so that the functional module 22 moves a certain distance in the direction of the plug module 3, and the plug module 3 will be preliminarily connected with the functional module 22, and the calibration block 51 and the calibration slot 5 are affected. 2, when the calibration block 51 and the calibration groove 52 cannot be docked and embedded, the movement of the functional module 22 is not enough to make the ejector pin 31 abut against the surface of the connecting base 221, and for the ejector pin 31 and the conductive contact 223, the two are not in a state where they can be directly connected. On the same radial section, the two are staggered at a certain angle, and then the plug module 3 is rotated. When the calibration block 51 is docked with the calibration groove 52, the ejector pin 31 also corresponds to the conductive contact 223. Under the action of the magnet, the functional module 22 can be moved again. Finally, the functional module 22 will be tightly connected to the plug module 3, and the ejector pin 31 and the conductive contact 223 will also be connected. Then it can be taken out for corresponding detection.

[0055] In this embodiment, if Figure 2 and Figure 4 As shown, the calibration block 51 has a protrusion 53, and the calibration groove 52 has a groove 54 corresponding to the protrusion 53. When the plug module 3 and the storage seat 21 rotate relative to each other, only one position can be docked so that the calibration block 51 can enter the calibration groove 52. Figure 4 The raised portion 53 may be a flange 531 on the circumferential side of the calibration block 51, or a cylinder 532 provided on the side of the calibration block 51. The cylinder 532 should be located at a position deviating from the center of the calibration block 51. Through the arrangement of the calibration block 51 and the calibration groove 52, the docking process between the functional module 22 and the plug module 3 is divided into two stages. The first stage is the initial connection state. The functional module 22 and the plug module 3 are connected at a certain distance to provide an operating space for the subsequent docking and conduction between the conductive contact 223 and the ejector pin 31, which is the second stage. In the second stage, the plug module 3 is rotated. The functional module 22 is relatively still at this time. When the calibration groove 52 is docked and embedded with the calibration block 51, it means that the conductive contact 223 and the ejector pin 31 are aligned in the axial direction of the storage seat 21. Under the arrangement of the magnet, the functional module 22 will move again and complete the connection with the plug module 3.

[0056] In this embodiment, the limiting mechanism 4 includes a limiting rod 41 and a trigger rod 42. A first sliding groove 43 for the limiting rod 41 to slide is formed in the storage base 21. The end of the limiting rod 41 is located inside the storage base 21. A limiting groove 44 adapted to the end of the limiting rod 41 is formed on the peripheral side of the connection base 221. A first spring 45 is installed in the first sliding groove 43. The elastic force of the first spring 45 acts on the limiting rod 41 to make the limiting rod 41 tend to move towards the inside of the storage base 21. A sliding cavity 46 for the trigger rod 42 to move is formed in the limiting rod 41. The trigger rod 42 is in abutment with the limiting rod 41 through an inclined inclined surface portion 47. When the trigger rod 42 is pressed, it pushes the limiting rod 41 to compress the first spring 45;

[0057] As Figure 5 shown, when the two trigger rods 42 are pushed by the moving plug module 3, the trigger rods 42 move and push the limiting rod 41 to move, causing the limiting rod 41 to move away from the connection base 221. At this time, the limiting mechanism 4 releases the restriction on the connection base 221. Under the suction force of the magnet, the connection base 221 moves a certain distance. If the ejector pin 31 and the conductive contact 223 are exactly aligned at this time, it directly enters the second state. If they are not aligned, the connection base 221 will only move a certain distance, and thus subsequent adjustments are required. In this embodiment, the relative position of the ejector pin 31 and the conductive contact 223 can be adjusted by rotating the plug module 3.

[0058] It should be noted that in order to improve the stability of the repeated use of the trigger rod 42, a spring piece 48 is installed between the trigger rod 42 and the storage base 21. The spring piece 48 provides power for the reset of the trigger rod 42, so that when the functional module 22 returns to the storage base 21, it can be limited and fixed.

[0059] In this embodiment, the locking mechanism 5 further includes a locking groove 55 formed inside the storage base 21. The locking groove 55 is composed of a first groove 551, a second groove 552, and a third groove 553. Both the first groove 551 and the third groove 553 are arranged along the axial direction of the storage base 21. The end of the first groove 551 is located at the end face of the storage base 21. The second groove 552 communicates with the first groove 551 and the third groove 553. A locking shaft 56 is arranged on the peripheral side of the connection base 221. The locking shaft 56 can move along the locking groove 55;

[0060] As Figure 5 shown, when the functional module 22 is located in the storage bin 2, the locking shaft 56 is at the bottom of the third groove 553, and at this time the connection base 221 is limited by the limiting mechanism 4, and the functional module 22 is stably restricted on the storage base 21;

[0061] During actual use, first, the staff moves the plug module 3 to the function module 22 to be connected. The pressing ring 33 on the plug module 3 first pushes the trigger rod 42 to move, causing the trigger rod 42 to drive the limit rod 41 to move so that the limit rod 41 releases the restriction on the connection base 221. At this time, under the restriction of the locking groove 55 and the locking shaft 56, the connection base 221 will be able to move along the axial direction of the storage base 21;

[0062] With the settings of magnet A and magnet B, the connection base 221 will move towards the plug module 3, and the locking shaft 56 will also move within the third groove 553. However, restricted by the calibration block 51 and the calibration groove 52, if the calibration block 51 and the calibration groove 52 fail to be directly embedded, at this time, the locking shaft 56 will still be within the third groove 553. That is to say, at this time, the locking shaft 56 on the connection base 221 can only move along the third groove 553 and cannot move along the second groove 552, and the connection base 221 cannot rotate, that is, the first unlocking state is reached;

[0063] The staff rotates the plug module 3 and is assisted in rotation by the rotating part 34 installed on the plug module 3. Under the suction force of the magnet, the plug module 3 and the function module 22 always have a tendency to approach each other. Under this tendency, the rotation of the plug module 3 will cause the calibration block 51 and the calibration groove 52 to be embedded at a certain position. And once the two can be embedded, it means that the position of the thimble 31 and the conductive contact 223 has been aligned and conducted. After the calibration block 51 and the calibration groove 52 are embedded, the function module 22 will approach the plug module 3 again, and the locking shaft 56 will also move to the intersection of the second groove 552 and the third groove 553, that is, the second unlocking state is reached;

[0064] In the second unlocking state, when the staff rotates the plug module 3, it will drive the function module 22 to rotate together. At this time, it is necessary to rotate the locking shaft 56 to the intersection of the second groove 552 and the first groove 551, and then directly pull it out to complete the connection and conduction process between the plug module 3 and the function module 22. After that, the corresponding overvoltage detection can be carried out;

[0065] After the detection is completed, the staff moves the plug module 3 back to the original storage base 21 for disassembly. When disassembling, it is necessary to first align the locking shaft 56 with the entrance of the locking groove 55. This process can be achieved by applying pressure while rotating the plug module 3, and then rotate the locking shaft 56 to the intersection of the second groove 552 and the third groove 553 to pull out the plug module 3, and then manually press the connection base 221 to complete the limiting through the limiting mechanism 4;

[0066] It should be noted that the magnet B in the plug module 3 can also be set to be flippable, that is, the magnet B can be flipped to change its magnetic pole direction, so that the original mutual attraction with the magnet A becomes mutual repulsion. After the locking shaft 56 moves into the second groove 552, the flippable magnet B can repel the magnet A, making the connection base 221 tend to move away from the plug module 3. When the locking shaft 56 moves to the third groove 553, under the action of the repulsive force, the connection base 221 moves to a position where it can be limited by the limiting mechanism 4. After the plug module 3 is removed, the limiting mechanism 4 can be reset to limit the connection base 221. The magnet B can be rotatably installed in the plug module 3 through a rotating shaft, and the magnetic pole can be changed by rotating the rotating shaft, or the magnet B can be set as an electromagnet.

[0067] The thimble 31 is slidably connected to the inner wall of the plug module 3. A second spring 32 is arranged between the thimble 31 and the plug module 3. The elastic force of the second spring 32 acts on the thimble 31 to make it tend to move away from the plug module 3.

[0068] A friction plate 224 is arranged on one side of the connection base 221. The friction plate 224 is installed on the arc seat 225. The arc seat 225 is slidably connected to the inner wall of the connection base 221 through a guide rod 226. An arc groove 227 is formed on one side of the connection base 221. The arc groove 227 is located between adjacent conductive contacts 223. The arc seat 225 can move into the arc groove 227. A third spring 228 is sleeved on the guide rod 226.

[0069] As Figure 6 shown, since the thimble 31 is generally in an external environment prone to oxidation, this easily leads to poor contact when the thimble 31 contacts the conductive contact 223, affecting the detection result. Therefore, through the arranged friction plate 224, in the second unlocking state, the rotation of the plug module 3 will drive the thimble 31 to scrape on the friction plate 224, removing the possible oxide layer at the contact part between the thimble 31 and the conductive contact 223, thus ensuring good contact. It should be understood that the adsorption force between the magnets is greater than the acting forces of the third spring 228 and the second spring 32. That is to say, the adsorption force of the magnets still meets the use requirements in the presence of the second spring 32 and the third spring 228.

[0070] Embodiment 2:

[0071] Please refer to Figure 8 and Figure 9 , on the basis of Embodiment 1, this embodiment provides a technical solution: the detection unit includes a differential amplification circuit and a signal conditioning circuit. The differential amplification circuit and the signal conditioning circuit are used to cooperate with the plugged-in plug module and the function module for on-line overvoltage detection. The differential amplification circuit includes an equivalent mutual capacitance C m1, equivalent mutual capacitance C m2 , mutual capacitance C m0 , stray capacitance C to ground s1 , stray capacitance C to ground s2 , impedance R m and a differential amplifier, the equivalent mutual capacitance C m1 is electrically connected to the equivalent mutual capacitance C m2 , the mutual capacitance C m0 is connected in series between the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 , the two ends of the impedance R m are electrically connected to the two ends of the mutual capacitance C m0 , the input terminals of the differential amplifier are respectively connected to the two ends of the impedance R m , one end of the stray capacitance C to ground s1 is electrically connected between the mutual capacitance C m0 and the equivalent mutual capacitance C m1 , the other end of the stray capacitance C to ground s1 is grounded, one end of the stray capacitance C to ground s2 is electrically connected between the mutual capacitance C m0 and the equivalent mutual capacitance C m2 , the other end of the stray capacitance C to ground s2 is grounded, and the differential amplifier circuit is electrically connected to the signal conditioning circuit.

[0072] , the connection position of the stray capacitance C to ground s1 with the mutual capacitance C m0 and the equivalent mutual capacitance C m1 is node ②, the connection position of the stray capacitance C to ground s2 , the mutual capacitance C m0 and the equivalent mutual capacitance C m2 is node ③, the intermediate connection position between the equivalent mutual capacitance C m1 and the equivalent mutual capacitance C m2 is node ①, node ① is the potential of the conductor under test, and its potential is U i , nodes ② and ③ are the output potentials of the two measurement electrodes with different equivalent areas, and the potential difference between them is U o .

[0073] , the node equation transfer functions of nodes ①, ②, and ③ are:

[0074] (1);

[0075] where:

[0076] ;

[0077] ;

[0078] Among them, the amplitude-frequency characteristic in the node equation transfer function is:

[0079] (2);

[0080] The phase-frequency characteristic in the node equation transfer function is:

[0081] (3);

[0082] where ω is the frequency;

[0083] In summary, node ① is the potential of the conductor under test, nodes ② and ③ are the output potentials of two measurement electrodes with different equivalent areas. The electrode potentials of floating nodes ② and ③ are input to the differential amplifier, and the input potential difference is U o . Among them, C m1 , C m2 are respectively the equivalent mutual capacitances between the two electrodes and the conductor under test, C s1 , C s2 are respectively the stray capacitances of the two electrodes to the ground, R m is the input impedance of the differential amplifier. There will be a mutual capacitance C m0 between the electrodes. It can be seen from the formula that increasing the value of the mutual capacitance C m0 will make the mutual inductor work in the self-integrating mode at the power frequency. At the same time, due to the very high input impedance of the integrated operational amplifier itself, this structure is easier to meet the self-integrating condition of R m C 2 >> 1. By increasing the value of C m0 , the voltage division ratio of the mutual inductor will also be increased and the phase difference will be reduced. By directly inputting the output voltage to the amplifier in a differential manner, the load resistance can be omitted while realizing self-integration, thus avoiding a series of problems brought by the load resistance;

[0084] Combined with Figure 8 and Figure 9 ; The overall structure is a multi-ring parallel electrode structure, which can maximize the value of C m0 in a smaller volume to achieve a higher voltage division ratio and a smaller phase difference; By processing the electrodes into printed circuit boards, the insulation degree can be improved while achieving higher precision and standardizing the parameters of each PCB. Its structure is as Figure 9 shown.

[0085] In Figure 9 , there are several annular electrodes with different radii on the top and bottom layers of the PCB. The annular electrodes on the top and bottom layers are respectively connected in parallel. The present invention is composed of several PCBs stacked closely in sequence. The annular electrodes on the top and bottom layers of each PCB are respectively connected in parallel. That is, the potentials of the top-layer electrodes and the bottom-layer electrodes are respectively Figure 8The potentials of the middle node ② and the node ③, and the output is the potential difference between the top electrode and the bottom electrode. The annular electrode is a perfect circle, and its Gaussian surface is orthogonal to the electric field strength, which can increase the equivalent area of the electrode to the conductor under test, thereby improving the sensitivity of the mutual inductor. At the same time, the circular annular structure is similar to the equipotential surface of the electric field around the conductor under test, which can make the charge distribution on the electrode uniform, while reducing the maximum value of the local electric field that causes insulation breakdown and minimizing the edge effect to reduce the electric field distortion caused by the electrode. Since there are mutual capacitances between all the electrodes, a relatively large capacitance value can be obtained after parallel superposition to make C m0 obtain a relatively large capacitance value.

[0086] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the present invention.

Claims

1. An adjustable overvoltage online intelligent detection device, comprising a main body shell, in which a detection unit is arranged, characterized in that: Also includes: A storage bin is provided with a plurality of storage seats for storing a plurality of functional modules. The functional module is composed of a connection base and a functional head. A magnet A is installed in the connection base. A conductive contact is provided on one side of the connection base. A plug module, one side of which is provided with a ejector pin and another magnet B is provided therein; A limiting mechanism, which is arranged on one side of the storage seat and is used to limit the movement of the connection base; A locking mechanism, comprising a calibration block and a calibration slot respectively mounted on opposite sides of the connection base and the plug module, the locking mechanism having a first unlocked state and a second unlocked state, in which the calibration block abuts against an edge of the calibration slot, and the plug module and the storage seat can rotate relative to each other, and in the second unlocked state, the calibration block is embedded in the calibration slot, and the ejector pin contacts and conducts with the conductive contact; The limiting mechanism comprises a limiting rod and a trigger rod, a first sliding groove for sliding the limiting rod is provided in the storage seat, an end of the limiting rod is located at the inner side of the storage seat, a limiting groove adapted to the end of the limiting rod is provided on the peripheral side of the connecting base, a first spring is installed in the first sliding groove, the elastic force of the first spring acts on the limiting rod to make the limiting rod have a tendency to move toward the inner side of the storage seat, a sliding cavity for moving the trigger rod is provided in the limiting rod, the trigger rod abuts against the limiting rod through an inclined slope portion, and when the trigger rod is pressed, the limiting rod is pushed to compress the first spring, and a spring sheet is installed between the trigger rod and the storage seat; During detection, the plug module moves axially along the storage seat and first acts on the limit mechanism to release the restriction on the connection base. Magnet B acts on magnet A to move the functional module to the first unlocked state, and the plug module is rotated to move the functional module to the second unlocked state.

2. The adjustable online overvoltage intelligent detection device according to claim 1 is characterized in that: The calibration block has a protrusion, and the calibration groove has a groove corresponding to the protrusion. When the plug module and the storage seat rotate relatively, only one position can be docked so that the calibration block can enter the calibration groove.

3. The adjustable online overvoltage intelligent detection device according to claim 1 is characterized in that: The locking mechanism also includes a locking groove opened on the inner side of the storage seat, and the locking groove consists of a first groove, a second groove and a third groove. The first groove and the third groove are both arranged axially along the storage seat, and the end of the first groove is located at the end surface of the storage seat. The second groove connects the first groove and the third groove. A locking shaft is arranged on the circumferential side of the connecting base, and the locking shaft can move along the locking groove.

4. The adjustable online overvoltage intelligent detection device according to claim 1 is characterized in that: The ejector pin is slidably connected to the inner wall of the plug module, and a second spring is arranged between the ejector pin and the plug module. The elastic force of the second spring acts on the ejector pin to make it tend to move away from the plug module.

5. The adjustable online overvoltage intelligent detection device according to claim 4 is characterized in that: A friction plate is provided on one side of the connecting base, and the friction plate is installed on the arc seat. The arc seat is slidably connected to the inner wall of the connecting base through a guide rod. An arc groove is opened on one side of the connecting base, and the arc groove is located between adjacent conductive contacts. The arc seat can move into the arc groove, and a third spring is sleeved on the guide rod.

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